How to Use a Light Box
Compact Fluorescent or LED Bulbs
Choose bright, energy efficient light bulbs that are "full spectrum" and "daylight balanced"
Don't mix different kind of light bulbs. Choose one kind and stick to it.
Use One, Two, or Three Lights
Choose one light to allow more shadow from one side.
Shadows make pictures look 3D.
Use one light on each side of the box to fill in the shadow.
If you play with the angles of the lights, some of the shadow on the subject will show, keeping the photo looking 3D.
Add a third light, shining through the top of the light box to get rid of most of the shadows.
This will also make your background really white.
Lightbox photos can still come out too dark, even when you've got plenty of light.
Use "Exposure Compensation" to keep your photos bright.
For best color results, avoid AWB (auto white balance). Instead, use the White Balance setting that matches the kind of light bulb ,you have.
Better yet, set a Custom White Balance to match the light exactly.